Interfacial Stress Intensity Factors for Edge-Cracked Bonded Semicircles and Strips Under Out-of-Plane Shear

2012 ◽  
Vol 180 (1) ◽  
pp. 119-127 ◽  
Author(s):  
Chih-Hao Chen ◽  
Chien-Chung Ke ◽  
Chein-Lee Wang
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Interfacial Stress ◽  
Intensity Factors ◽  
Plane Shear ◽  
Out Of Plane

On the Characterization of Fatigue Crack Growth in a Plate With a Single-Sided Repair

2004 ◽  
Vol 126 (2) ◽  
pp. 192-198 ◽  
Author(s):  
C. N. Duong ◽  
C. H. Wang
Keyword(s):  
Fatigue Crack ◽  
Stress Intensity ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Stress Intensity Factors ◽  
Load Path ◽  
Intensity Factors ◽  
Analytical Work ◽  
Out Of Plane ◽  
Plane Bending

An unsupported cracked plate repaired with a reinforcement bonded on one side may experience considerable out-of-plane bending due to the load-path eccentricity. This out-of-plane bending causes the stress intensity factor at the crack tip to vary significantly through the plate’s thickness with a maximum value attained at the un-patched side of the crack. Even though significant analytical work has been done in the past to evaluate these thickness-varying stress intensity factors, however, to the authors’ knowledge, little work has been done to characterize the fatigue crack growth in a plate with a single-sided repair. The purposes of the present work are to (i) assess the accuracy of the available analytical methods for predicting the stress intensity factors of the panels with a single-sided repair and more importantly, and (ii) characterize the fatigue crack growth in these panels, using test results generated recently under the Composite Repair of Aircraft Structures (CRAS) program.

Numerical Fracture Analysis of Compact Tension Shear (CTS) Specimens with Tortuous Crack Fronts

2015 ◽  
Vol 665 ◽  
pp. 77-80 ◽  
Author(s):  
Jana Horníková ◽  
Stanislav Žák ◽  
Pavel Šandera
Keyword(s):  
Finite Element ◽  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Crack Front ◽  
Compact Tension ◽  
Polycrystalline Materials ◽  
Intensity Factors ◽  
Plane Shear ◽  
Friction Forces ◽  
Loading Mode

The aim of the contribution is to assess the influence of the microstructure of materials on the effective values of stress intensity factors. In this paper some results of 3D-finite element analyses of a CTS-specimen with a tortuous crack are presented. The specimen is subject to an in-plane shear remote loading (mode II) and tortuous crack flanks simulate rough cracks in polycrystalline materials. Finite element calculation by using the commercially available FE-code ANSYS has been carried out to determine stress/strain distribution in the vicinity of crack front and the local values of stress intensity factors are evaluated along the crack front. The existence of friction forces generated by sliding of crack wake asperities is included into calculations. Respective effective values are determined in dependence of the roughness of crack flanks. Results achieved allows to characterize the influence of microstructure to crack growth.

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